export {}; //当前文件是一个模块，对外暴露啥，你才能用啥

let name: string = "jshand";
let age: number = 100;
let success: boolean = true;

// name = 100
// success =  false

//定义方法

function sum(numa: number, numb: number) {
  console.log("numa  + numb = ", numa + numb);
}

// sum(100,200)
// sum(100,"200")
// sum(100,200,300)
